RetroShare is an Open Source, cross-platform, Friend-2-Friend, and
secure decentralised communication platform. It lets you securely chat
and share files with your friends and family, using a web-of-trust to
authenticate peers and OpenSSL to encrypt all communication.  RetroShare
provides filesharing, chat, messages, forums and channels.

Features:
    Serverless, completely decentralised
    Multiple simultaneous downloads / uploads
    Search Friends
    Messages
    Forums
    Channels
    Voice over IP
    Instant messaging
    Groupchat
    GnuPG Authentication
    OpenSSL Encryption
    adding downloads via website links
    Plugins support
    UPnP / NAT-PMP port forwarding support
    Graphical User Interface written with Qt4 toolkit
    System tray integration
